Help getting xml from external domain

1

Hi there
I am trying to get a xml into flash from an external domain using a PHP proxy to get around the cross domain issue.

I have created a simple swf file that is meant to load the xml and print out some data from the received file. Unfortunately I havent been able to get it to work as yet.
Here is the action script

    var Sender = new LoadVars();
    var GetData = new XML();
    GetData.ignoreWhite = true;
    thefirst =[];
    GetData.onLoad = function(success) {
    if (success){

    list = this.firstChild;

    thefirst[0] = list.childNodes[0].childNodes[0].firstChild.nodeValue;

    _root.test.text = GetData;
    _root.test2.text = list;
    _root.test3.text = thefirst[0];
    }

    };
 
      Sender.sendAndLoad("proxy.php", GetData, "POST");
    theBtn.onRelease = function() {
    Sender.sendAndLoad("proxy.php", GetData, "POST");

    };

and here is the PHP which is in the file proxy.php on in my root directory of my website.

<?php 

$dataURL = "http://rss.bigfishgames.com/rss.php?username=firehawk777&type=2&locale=en&gametype=pc&content=glrank"; 

readfile($dataURL);



?>

Please can someone explain what I am doing wrong?